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E. Nourafkan,A. Alamdari 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
The present study investigates the synthesis of silver nanoparticles through the method of reverse emulsions using the precursor of AgNO3 and the reduction agent of hydrazine. The influence of several surfactants with different Hydrophile–Lipophile Balance (HLB) on the size distribution and morphology of synthesized nanoparticles was also studied. The nonionic surfactants of Span 80 and PEG 1000, the anionic surfactant of sodium dodecyl sulfate, and the cationic surfactant of cetyl-trimethyl ammonium bromide were examined. The produced silver nanoparticles were characterized using methods of transmission electron microscopy, scanning electron microscopy, X-ray diffraction, UV–vis spectropho- tometry, X-ray photoelectron spectroscopy and laser scattering analyzer.
Synthesis of stable iron oxide nanoparticle dispersions in high ionic media
Ehsan Nourafkan,Maryam Asachi,Hui Gao,Ghulum Raza,Dongsheng Wen 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.50 No.-
A novel one-pot method was developed in this work to synthesize and disperse nanoparticles in a binarybasefluid. As an example, stable magnetite iron oxide (Fe3O4) dispersions, i.e., nanofluids, were producedin a high ionic media of binary lithium bromide-water using a microemulsion-mediated method. Theeffects of temperature and precursor concentration on morphology and size distribution of producednanoparticles were evaluated. An effective steric repulsion force was provided by the surfacefunctionalization of nanoparticles during the phase transfer, supported by the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. The formed nanoparticles exhibited a superior stability againstagglomeration in the presence of high concentrations of lithium bromide, i.e., from 20 to 50 wt.%, whichmake them good candidates for a range of novel applications.
Ehsan Nourafkan,Maryam Asachi,Zhongliang Hu,Hui Gao,Dongsheng Wen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Synthesis of nanoparticles (NPs) that can withstand high temperature and high salinity (HT-HS) is a big challenge in the research community. A novel strategy to synthesize stable nanoparticles under harsh environment (HT-HS) is proposed in this work by using the synergistic effect of a surfactant mixture. Long-term stable iron oxide nanoparticles at HT-HS conditions were produced and stabilized by two different surfactant classes, i.e. sulfonate surfactant for high temperature resistance and ethoxylated alcohol surfactant for high salinity resistance. The results prove that the new strategy could be used for production of stable NPs which is suitable for enhanced oil recovery application.